Shell-like structure bionic composite phase-change heat storage material and preparation method thereof

A technology of composite phase change and heat storage material, applied in the field of shell-like structure biomimetic composite phase change heat storage material and its preparation field, can solve the problem that high thermal conductivity ceramic skeleton is rarely researched, etc., achieves enhanced mechanical strength and simple preparation method , the effect of rapid heat storage

Inactive Publication Date: 2021-04-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many biological structures in nature with excellent performance, which are more worthy of our reference. However, there are few studies on the preparation of high thermal conductivity ceramic skeletons in the field of bionics.

Method used

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  • Shell-like structure bionic composite phase-change heat storage material and preparation method thereof
  • Shell-like structure bionic composite phase-change heat storage material and preparation method thereof
  • Shell-like structure bionic composite phase-change heat storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Mix 20g of silicon carbide powder with 0.2g of yttrium oxide, 0.2g of aluminum oxide, and 0.2g of sodium carboxymethyl cellulose, and then add 19.26g of deionized water to make the solid content respectively 20vol%, 25vol%, 27.5vol%, 30vol%, then transferred to a ball mill jar and ball milled at a speed of 300r / min for 2h, put the ground ceramic slurry into a vacuum oven for degassing for 10min, then pour it into a mold, put it into a freeze dryer, and put it into a freeze dryer at -40 ℃ pre-freezing for 1 h and vacuum drying. After freeze-drying, the freeze-dried ceramic green body was fired in a muffle furnace at 500°C for 4 hours to remove sodium carboxymethyl cellulose, and then sintered in a hot-press furnace at 1950°C for 4 hours without pressure to obtain a sheet-mounted oriented hole structure. silicon carbide ceramic skeleton. Take 20g of erythritol and put it into an oven at 150°C for melting, move it into a vacuum environment at 130°C, put the sintered silic...

Embodiment 2

[0032] 20g surface modified aluminum nitride powder and 0.4g yttrium oxide, 0.2g carboxymethyl cellulose

[0033] After mixing the sodium evenly, add 19.26g of deionized water, so that the solid content is 20vol%, 25vol%, 27.5vol%, and 30vol%, respectively, and then transfer it to a ball mill jar for ball milling at a speed of 300r / min for 2 hours, and the ground ceramic slurry Put the material in a vacuum drying oven for degassing for 10 minutes, then pour it into a mold, put it into a freeze dryer, pre-freeze at -40°C for 1 hour, and then carry out vacuum drying. Furnace hollow firing for 4 hours to remove sodium carboxymethyl cellulose, followed by pressureless sintering in a hot-press furnace at 1900°C for 4 hours to obtain a silicon carbide ceramic skeleton with a sheet-mounted oriented hole structure. Take 20g of lithium nitrate and melt it in a furnace at 270°C, then move it into a vacuum environment at 260°C, put the sintered silicon carbide ceramic skeleton into the m...

Embodiment 3

[0035] Mix 20g of silicon carbide powder with 0.4g of yttrium oxide, 0.4g of aluminum oxide, 0.2g of sodium carboxymethyl cellulose, and 0.1g of sodium dodecylbenzenesulfonate, and then add 16.77g of deionized water to make the solid content 20vol%, 25vol%, 27.5vol%, 30vol%, and then transferred to a ball mill tank at a speed of 600r / min for ball milling for 2 hours, put the ground ceramic slurry into a vacuum drying oven for degassing for 10 minutes, and then pour it into a mold Put it into a freeze dryer, pre-freeze at -40°C for 1 hour, and then dry it in vacuum. After freeze-drying, the freeze-dried ceramic green body was fired in a muffle furnace at 500°C for 4 hours to remove sodium carboxymethylcellulose and sodium dodecylbenzenesulfonate, and then it was pressed in a hot-press furnace at 1950°C without pressure. After sintering for 4h, a silicon carbide ceramic skeleton with a sheet-mounted oriented hole structure was obtained. Take 20g of erythritol and melt it in an ...

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Abstract

The invention relates to a shell-like structure bionic composite phase-change heat storage material and a preparation method thereof. The shell-like structure bionic composite phase-change heat storage material comprises a phase-change material, a ceramic skeleton with a sheet-shaped pore structure and a ceramic additive, wherein the porosity of the ceramic skeleton with the sheet-shaped pore structure is 50%-85%, and the mass percentage of the ceramic additive is 0%-10%. The heat conductivity coefficient of the phase-change heat storage material can be greatly improved. The phase-change material is immersed into a high-thermal-conductivity-coefficient ceramic skeleton which is prepared by a freeze-drying method and has a sheet-shaped pore structure under a vacuum condition to form a compound with a shell-like structure. The method is simple in preparation process and high in adjustability, and the prepared composite material can be applied to the fields of solar building heating, waste heat utilization and the like.

Description

technical field [0001] The invention relates to the technical field of producing heat storage materials by chemical and chemical methods and the field of energy material science, in particular to a shell-like structure bionic composite phase-change heat storage material and a preparation method thereof. Background technique [0002] With the further consumption of energy resources and the further implementation of my country's energy supply-side reform policy, how to efficiently utilize solar energy and industrial waste heat has become a research trend. Phase change heat storage technology does not involve chemical changes, and the phase change process can be used to store a large amount of heat while keeping the temperature constant during use. However, the low thermal conductivity of phase change heat storage materials is its main disadvantage, which limits its effectiveness in actual scenarios of solar energy or waste heat utilization. [0003] At present, for phase chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/066
Inventor 刘向雷宋亚楠宣益民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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